Netscape Navigator 6 strangeness

Anyone else hosting their site on a 400 and using IBM's HTTP server having
problems with Netscape Navigator 6 not displaying images on their pages?
All versions of IE and all versions of NN prior to 6 seem to be having no
problems.  Even on this page:

http://www.estes-express.com/nn6test2.htm

Which is certified as valid by the W3C the images still don't show up.  If I 
move the same page to another server, it works fine.

Mike Eovino
E-commerce and Customer Development Manager
Estes Express Lines
http://www.estes-express.com

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